The actual extension namespace alias should be determined on a per-message basis by the party composing the messages, in such a manner as to avoid conflicts between multiple extensions. For the purposes of this document and when constructing OpenID 1.1 messages, the extension namespace alias SHALL be "pape".

Additionally, this specification uses name spaces for the custom authentication level identification. (さらに、カスタム認証レベル識別にネームスペースを使うことができます）It is in the form of

openid.pape.auth_level.ns.<cust>=http://some.authlevel.uri

The actual extension namespace alias should be determined on a per-message basis by the party composing the messages, in such a manner as to avoid conflicts between multiple extensions. For the purposes of this document and when constructing OpenID 1.1 messages, the one custom authentication level identification extension namespace defined by this specification is "nist". Others may also be defined and used by implementations, for example, "jisa".